Look at Zidane. He is Algerian, Muslim (I believe), and he has started his coaching career very slowly. He is coaching Real Madrid Castilla IIRC and not hurrying to get the job he could walk into immediately at say Getafe or Rayo Vallecano.
What needs to happen is that black coaches should be encouraged - especially at lower leagues. Eventually the best will rise up just like they do on the pitch. That way it balances out the palying field and answers the question of whether or not they can handle it. I think they can but the process has to be started - it never was and I think that is a problem. So if you're complaining that you're black and can't be hired, why not try League 2 or lower? I'm sure there are clubs that would jump at the opportunity.
Danilo, how do you know they've not tried at lower levels? I think the complaint is not that they are no black coaches or managers in the top flight. The complaint is that they are very few black managers and coaches in professional football full stop. Many black players do their coaching courses and when it comes to giving them a post at a lower level, they do not get given a chance.
There are a high number of black players in professional football, with every top team having at least a couple of black players. A few decades ago, there were very few such players in the top clubs. We all remember how Barnes was treated. Now it is normal to have black players for us. The same thing is happening with coaches and managers. All they are asking is to be given a chance. How can they prove themselves if they cannot even get a job at the lowest level?